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Making your own fuseable links

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Wed Jul 11, 2018 8:32 am Post subject: Making your own fuseable links

Hi Guys



Where can you get the 'SILICONE COVERED FIBREGLASS SLEEVING' to make your own fuseable links



Regard: John

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nuckolls.bob(at)aeroelect
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Posted: Wed Jul 11, 2018 10:33 am Post subject: Making your own fuseable links

At 11:32 AM 7/11/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>



 Hi Guys



 Where can you get the 'SILICONE COVERED FIBREGLASS SLEEVING' to make your own fuseable links



 Regard: John



 	


 https://goo.gl/uuWsgi 



  Where are you using a fusible link?



 

 

   Bob . . .

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Thu Jul 12, 2018 1:58 am Post subject: Re: Making your own fuseable links

Hi Bob



Your answer relates to the Z11 wiring we are using: specifically the Endurance Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus.



We are doing without the the main Battery Bus as not required, now this leaves us without the 7 amp protection, so I was going to put a 'fusible link' at the Battery Contactor - incidently we are using 14AWG (because we have it, we do not have any 16AWG).



I need to make up a 18AWG fusible Link



John

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nuckolls.bob(at)aeroelect
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Posted: Thu Jul 12, 2018 4:55 am Post subject: Making your own fuseable links

At 04:58 AM 7/12/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>



 Hi Bob



 Your answer relates to the Z11 wiring we are using: specifically the Endurance Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus.



 We are doing without the the main Battery Bus as not required, now this leaves us without the 7 amp protection, so I was going to put a 'fusible link' at the Battery Contactor - incidently we are using 14AWG (because we have it, we do not have any 16AWG).



 I need to make up a 18AWG fusible Link 	


   I'd just move the 30A in-line alternate feed

   fuseholder over to the battery, eliminate

   the battery bus, mount the alternate feed

   relay adjacent to the battery contactor.



   Use the in-line fuseholder to 'jumper'

   between the alternate feed relay and

   battery contactor.



 

 

   Bob . . .

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Thu Jul 12, 2018 9:48 am Post subject: Re: Making your own fuseable links

Hi Bob



It's obvious that I do not have the latest version of Z11 (mine being rev:M) as the drawing does not include any '30A in-line alternate feed 

fuseholder' or the 'alternate feed relay' which you mention.



What 'revision' are we on now and can you give me a link please



Regards: John

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user9253

Joined: 28 Mar 2008
Posts: 1926
Location: Riley TWP Michigan

Posted: Thu Jul 12, 2018 11:20 am Post subject: Re: Making your own fuseable links

Here is a link to Bob's electrical drawings.

http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/

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_________________
Joe Gores

JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Fri Jul 13, 2018 4:19 am Post subject: Re: Making your own fuseable links

Hi Bob



I can see where we are now with Z11 rev: P (thank you user9253-Joe Gores for the link), I'm sticking with Rev: M (no 30 amp in-line fuse or or E-Bus alternate feed relay) - so it's a fusible link off the live side of the Battery contactor



Regards: John

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 13, 2018 5:50 am Post subject: Making your own fuseable links

At 07:19 AM 7/13/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>



 Hi Bob



 I can see where we are now with Z11 rev: P (thank you user9253-Joe Gores for the link), I'm sticking with Rev: M (no 30 amp in-line fuse or or E-Bus alternate feed relay) - so it's a fusible link off the live side of the Battery contactor



 Regards: John



 

 	


   Wouldn't do that myself but as you wish . . .



 

   Bob . . .

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 13, 2018 12:33 pm Post subject: Making your own fuseable links

 	  Quote: 	
		  

   Wouldn't do that myself but as you wish . . . 	


   Got a private email seeking clarification of what

   was correctly perceived as a terse reply. My

   apologies.



   Recall that the legacy 'rule of thumb' for always

   hot feeders in TC aircraft suggested they

   be protected at not more than 5A. This HAD to

   be a rule of thumb . . . cause the 5A figure

   was a constant whether we were talking about

   28 vs. 14v and breakers vs. fuses.



   I've asked if analysis was offered for mitigating

   potential energy dissipation that drove

   the 5A figure . . . nobody I knew was aware of

   any such study.



   Nonetheless, FMEA deliberations confirmed the

   notion that such wires SHOULD be of some limited

   ability to conduct post-crash energy.

   So for the Z-figures, we adopted 7A in fuses

   and 5A in breakers in 14v systems.



   The 7A fuse seemed to give good coverage for

   most boost pumps and electronic ignition systems

   of the time. A little later on, the Endurance

   Bus came along. At that time, it was possible

   to craft an endurance load that did not exceed

   the 7A-rule for always hot feeders.



   At some later time, Z-13/8 came along which offered

   an opportunity to support e-bus/battery bus loads

   up to and including 10A. We also had builders 

   wanting to support e-bus loads in excess of 10A.



   At this time, the e-bus alternate feed relay was

   added to become a mini-battery contactor that supported

   only e-bus loads. At that time, protection of that

   feed path was boosted to 15A . . . and COULD be

   larger still.



   This because crash safety for the feed path

   changed from ALWAYS HOT protected at 7A to

   CREW CONTROLLED with no practical limit.     



 



 [img]cid:.0[/img]



 

   If one does not require a battery bus

   but with 'larger' e-bus loads, then the alternate

   feed relay is still recommended. The relay

   is mounted close to the battery contactor

   hence a short jumper between the two devices.

   That jumper is easily fabricated with an

   in-line fuse holder. the in-line fuse is MANY

   times faster than a fusible link.



   As we've discussed quite a few times over the

   years, fusible links behave more like current

   limiters . . . very slow compared to fuses.

   They are not recommended for in situations

   other than those illustrated in the Z-figures.



 

   Bob . . .

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